removing required .navbar-static class, rewrote docs to reflect the change, and updated the upgrade docs page to include the navbar section

docs/templates/pages/upgrading.mustache

@@ -114,6 +114,15 @@
     <li>{{_i}}Pills were restyled to be less rounded by default{{/i}}</li>
     <li>{{_i}}Pills now have dropdown menu support (they share the same markup and styles as tabs){{/i}}</li>
   </ul>
+  <h3>{{_i}}Navbar (formerly topbar){{/i}}</h3>
+  <ul>
+    <li>{{_i}}Base class changed from <code>.topbar</code> to <code>.navbar</code>{{/i}}</li>
+    <li>{{_i}}Now supports static position (default behavior, not fixed) and fixed to the top of viewport via <code>.navbar-fixed-top</code> (previously only supported fixed){{/i}}</li>
+    <li>{{_i}}Added vertical dividers to top-level nav{{/i}}</li>
+    <li>{{_i}}Improved support for inline forms in the navbar, which now require <code>.navbar-form</code> to properly scope styles to only the intended forms.{{/i}}</li>
+    <li>{{_i}}Navbar search form now requires use of the <code>.navbar-search</code> class and its input the use of <code>.search-query</code>. To position the search form, you <strong>must</strong> use <code>.pull-left</code> or <code>.pull-right</code>.{{/i}}</li>
+    <li>{{_i}}Added optional responsive markup for collapsing navbar contents for smaller resolutions and devices. <a href="./components.html#navbar">See navbar docs</a> for how to utilize.{{/i}}</li>
+  </ul>
   <h3>{{_i}}Dropdown menus{{/i}}</h3>
   <ul>
     <li>{{_i}}Updated the <code>.dropdown-menu</code> to tighten up spacing{{/i}}</li>